<template>
    <div class="article-container">
      <!-- 导航栏 -->
      <van-nav-bar
        class="page-nav-bar"
        left-arrow
        title="黑马头条"
        @click-left="$router.back()"
      ></van-nav-bar>
      <!-- /导航栏 -->

      <div class="main-wrap">
        <!-- 加载中 -->
        <div v-show="state === 100" class="loading-wrap">
          <van-loading
            color="#3296fa"
            vertical
          >加载中</van-loading>
        </div>
        <!-- /加载中 -->

        <!-- 加载完成-文章详情 -->
        <div class="article-detail" v-show="state === 200">
          <!-- 文章标题 -->
          <h1 class="article-title">{{article.title}}</h1>
          <!-- /文章标题 -->

          <!-- 用户信息 -->
          <van-cell class="user-info" center :border="false">
            <van-image
              class="avatar"
              slot="icon"
              round
              fit="cover"
              :src="article.aut_photo"
            />
            <div slot="title" class="user-name">{{article.aut_name}}</div>
            <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
            <!-- <van-button
              class="follow-btn"
              type="info"
              color="#3296fa"
              round
              size="small"
              icon="plus"
            >关注</van-button> -->
            <!-- <van-button
              class="follow-btn"
              round
              size="small"
            >已关注</van-button> -->
            <FollowUser
            class="follow-btn"
            :isFollowed = "article.is_followed"
            :userId = "article.aut_id"
            @update_is_followed="article.is_followed = $event"
            />
          </van-cell>
          <!-- /用户信息 -->

          <!-- 文章内容 -->
          <div class="article-content markdown-body" ref="article-content" v-html="article.content"></div>
          <van-divider>正文结束</van-divider>
          <ArticleComment :articleId="articleId"
           @comment-successLoad="commentSuccessLoad"
           :list="commentList"
           @reply="showpopup"
          ></ArticleComment>
        </div>
        <!-- /加载完成-文章详情 -->

        <!-- 加载失败：404 -->
        <div class="error-wrap" v-show="state === 404">
          <van-icon name="failure" />
          <p class="text">该资源不存在或已删除！</p>
        </div>
        <!-- /加载失败：404 -->

        <!-- 加0异常） -->
        <div class="error-wrap" v-show=" state === 500">
          <van-icon name="failure" />
          <p class="text">内容加载失败！</p>
          <van-button class="retry-btn" @click="loadArticle">点击重试</van-button>
        </div>
        <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->

      </div>

      <!-- 底部区域 -->
      <div class="article-bottom">
        <van-button
          class="comment-btn"
          type="default"
          round
          size="small"
          @click="postCommentShow = true"
        >写评论</van-button>
        <van-icon
          name="comment-o"
          :info="totalCommentCount"
          color="#777"
        />
        <CollectArticle
        class="btn-item"
        v-model="article.is_collected"
        :articleId="article.art_id"
        ></CollectArticle>
        <LikeArticle
        class="btn-item"
        v-model = "article.attitude"
        :articleId="article.art_id"
        ></LikeArticle>
        <van-icon name="share" color="#777777"></van-icon>
      </div>
      <van-popup v-model="postCommentShow"
      closeable
      position="bottom"  >
      <CommentPost :targetId="articleId"
      @post-success="onPostCommentSuccess"
      ></CommentPost>
      </van-popup>
      <!-- /底部区域 -->
      <van-popup v-model="isReplyShow"
      position="bottom"   style="height: 100%" >
      <CommentReply v-if ='isReplyShow'  :comment="currentComment" @click-close="isReplyShow = false"></CommentReply>
      </van-popup>
    </div>
  </template>

<script>
import CommentReply from './components/comment-reply.vue'
import CommentPost from './components/comment-post.vue'
import ArticleComment from './components/article-comment.vue'
import FollowUser from '@/components/followUser'
import CollectArticle from '@/components/collectArticle'
import LikeArticle from '@/components/likeArticle'
import { getArticleById } from '@/api/article'
import { ImagePreview } from 'vant'
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    ArticleComment,
    CommentPost,
    CommentReply
  },
  provide: function () {
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  data () {
    return {
      article: {},
      state: 100,
      totalCommentCount: 0,
      postCommentShow: false,
      commentList: [],
      isReplyShow: false,
      currentComment: {}
    }
  },
  computed: {},
  watch: {},
  created () {
    this.loadArticle()
  },
  mounted () {},
  methods: {
    showpopup (comment) {
      this.isReplyShow = true
      this.currentComment = comment
    },
    onPostCommentSuccess (data) {
      this.postCommentShow = false
      this.commentList.unshift(data.new_obj)
    },
    commentSuccessLoad (data) {
      this.totalCommentCount = data.total_count
    },
    change () {
      const add = '<img src="https://toutiao.itheima.net/resources/images/15.jpg"> <p>越是排在左侧的重复类量词匹配优先级越高。</p> <p>下面示例显示当多个重复类量词同时满足条件时，会在保证右侧重复类量词最</p> <div>越是排在左侧的重复类量词匹配优先级越高。，会在保证右侧重复类量词最</div> <img src="https://toutiao.itheima.net/resources/images/18.jpg">'
      //  con.replace()
      this.article.content = this.article.content + add
    },
    preparePreview () {
      const content = this.$refs['article-content']
      const imgs = content.querySelectorAll('img')
      const srcs = []
      imgs.forEach((item, index) => {
        srcs.push(item.src)
        item.onclick = function () {
          ImagePreview({
            images: srcs,
            startPosition: index
          })
        }
      })
      window.console.log(srcs)
    },
    async loadArticle () {
    //  const imgs=['','','','']
      this.state = 100
      try {
        const { data } = await getArticleById(this.articleId)
        this.article = data.data

        //   this.article.content.
        this.change()

        setTimeout(() => {
          this.preparePreview()
        }, 0)

        this.state = 200
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.state = 404
        } else {
          this.state = 500
        }
        window.console.log(err)
      }
    }

  }
}
</script>

  <style scoped lang="less">
  @import  './github-markdown.css';
   .article-container {
    .main-wrap {
      position: fixed;
      left: 0;
      right: 0;
      top: 92px;
      bottom: 88px;
      overflow-y: scroll;
      background-color: #fff;
    }
    .article-detail {
      .article-title {
        font-size: 40px;
        padding: 50px 32px;
        margin: 0;
        color: #3a3a3a;
      }

      .user-info {
        padding: 0 32px;
        .avatar {
          width: 70px;
          height: 70px;
          margin-right: 17px;
        }
        .van-cell__label {
          margin-top: 0;
        }
        .user-name {
          font-size: 24px;
          color: #3a3a3a;
        }
        .publish-date {
          font-size: 23px;
          color: #b7b7b7;
        }
        .follow-btn {
          width: 170px;
          height: 58px;
        }
      }

      .article-content {
        padding: 55px 32px;
        /deep/ p {
          text-align: justify;
        }
      }
    }

    .loading-wrap {
      padding: 200px 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      background-color: #fff;
    }

    .error-wrap {
      padding: 200px 32px;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background-color: #fff;
      .van-icon {
        font-size: 122px;
        color: #b4b4b4;
      }
      .text {
        font-size: 30px;
        color: #666666;
        margin: 33px 0 46px;
      }
      .retry-btn {
        width: 280px;
        height: 70px;
        line-height: 70px;
        border: 1px solid #c3c3c3;
        font-size: 30px;
        color: #666666;
      }
    }

    .article-bottom {
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      display: flex;
      justify-content: space-around;
      align-items: center;
      box-sizing: border-box;
      height: 88px;
      border-top: 1px solid #d8d8d8;
      background-color: #fff;
      .comment-btn {
        width: 282px;
        height: 46px;
        border: 2px solid #eeeeee;
        font-size: 30px;
        line-height: 46px;
        color: #a7a7a7;
      }
      .van-icon {
        font-size: 40px;
        .van-info {
          font-size: 16px;
          background-color: #e22829;
        }
      }
      .btn-item {
      border: none;
      width: 46px;
      padding: 0;
      height: 46px;
      line-height: 46px;
      color: #777777;
      .van-loading{
           max-width: 46px;
      }
    }
    }
  }
  </style>
